> I'm interested in SLURM / OpenMPI startup numbers, but I haven't
> done this testing myself. We're stuck with an older version of
> SLURM for various internal reasons, and I'm wondering whether it's
> worth the effort to back port the PMI2 support. Can you share some
> of the differences in times at different scales?

We've not looked at startup times I'm afraid, this was time to
solution. We noticed it with Slurm when we first started using on
x86-64 for our NAMD tests (this from a posting to the list last year
when I raised the issue and were told PMI2 would be the solution):